Photographic-printing machine



ll. J. ROTH.

PIIoToGIIAPIIIc IIIINTINI;l MACHINE.

APPLICATION FILED MN. 7| i920.

PaIenI/a May 2, 1922'.

2 SHEETS-SHEET l.

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INVENToR. @d

' ,ATToRNEY..

J. J. ROTH. PHoIoeRIIPIIIc PIIINTING MACHINE.

APPLICATION FILED IAN. 7 1920.

Patented May 2, 1922.

2 SHEETS-SHEET -2.

fig. 6

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WL!" ATTORNEY,

lUNITED STATES PATENT oFFlcE.

t JOHN J. Born, or DAYTON,` omo.

rHoToGnAPnIc-PRINTING MAcHmE.

Specification of Letters Patent.

Patented May 2,1922.

Application led January 7, 19,26. Serial No. 349,969.

as at present constructed, it is necessary to hold the contact lid against. the printing glass by hand, or through spring catches or other engaging elements. volves unnecessary labor, but inferior contact where the contact lid is not held` tightly against the printing glass kby the operator. My improved means for insuring contact contemplates the use of a roll-top lid which makes the vcontact operation automatic without the use of catches, and leaves both hands of the operatoi'free'.

Other important and incidental objects will be brought out in the following specication and particularly set forth in the subjoined claims.

` The preferred form of embodiment of my invention is illustrated in the accompany ing drawings, of which Figure 1 is a side elevational view of my improved machine. Figure 2 is a top plan view of the contact lid. Figure 3 is a side elevational view of the contact lid resting over the printing glass. Figure 4 is a front view of the printingmachine.y Figure 5 is a front view of the carriage, showing the front contact spring secured thereto. And Figure 6 is a front view of the front roller and felt whichxpasses around it.

Throughout the specification and drawings, similar reference characters denote cor.- responding parts. j l

Referring to the accompanying drawings,

i lthe numeral 1 designates the top of a photographic printing l machine, which contains the usual printing opening 2 thatv is covered by a glass 3 whose top is flush with the top surface of the printing machine top 1.

Permanently securedto the top 1 ofthe printing machine, immediately behind and Vat each side of the printing opening 2, is a bracket 4 from they upper ymiddle portion of which there projects inwardly an arml 5.

This not :only in- The inner end of each arm 5 terminates in a core 6 for a ball bearing race 7 containing balls 8 over which an elongated tube V9 is adapted to travel. (See Figures 4 and 5.) The arms 5 in Vwhich the ball bearing races 7. are provided, project loosely into `the tubes 9l through slotsl() longitudinally formed in the latter, whereby said tubes may have a free movement back and forth over the balls 8 to support the carriage now to be described.

Referring to Figures 2 and 3, there project upwardly from between the yfront ends of the ltubes 9, 9, a pair'of oppositely disposed legs 11, 11, of a guard 12. These legs terminate at their lower ends in cupped ends 13, 13,1which are brazed to the lower eripherie's of the elongated` tubes 9, 9. hind the guard 12 there project between the elongated tubes 9, 9, two transverse carriagey members 14, 14 having cupped ends 15, 15, similar to the cupped ends 13, 13 of the legs 11, 11 and likewise brazed to the lower peripheries of the elongated tubes 9, 9.

Below the transverse members 14, 14 is abase plate 16 preferably constructed of one piece of metal having upturned` sides inl which are formed oppositely disposed notchesy 17, 17 to receive the ends of the transverse members 14, 14 by which the baseis moved back and forth for a purpose to be hereinafter described. The end sections of the notched sides of the base 16 are formed to provide outwardly projecting bearings 18, 18 at eachv end for ashaft 19 of a roller 20. (SeeFigures 1, 2,y and 3). The bear ings 18, 18 are reinforced by 4bronze .pieces 21, 21 similar in shape to said bearings 18, 1S and riveted-tol the latter.

Around the rollers `20, 20 passes a Vwide strip of canvas 22 or other iiexible material whose free ends pass downwardly through va slot in the top 1, the forward free end being turned undersaid top and secured thereto by screws 23, The other free end of the canvas 22 is sewed' around a transverse rod 24 having vertically disposed flattened ends 25, 25. 'f In each end 25 `there is a threaded hole adapted to receive thethreaded end of a bolt 26 yloosely supported by two vertical guides 2 7, 27 secured to lthe underside of the top 1. When this bolt is turned, it will draw its respective end of the rod 24 toward it to adjust the tautness of the canvas 22.

the canvas 22, is a strip of felt 28 the front end of which is sewed to the canvas at a point which will permit said telt to fully cover the opening 2 when the carriage is in its eXtreme forward position. Immediately behind the canvas 22 there is glued to the upper surface of the printing machine top 1, a board 29 ot the same thickness and width as the telt 28, to present a level surface for the 'contact lid to roll upon. (See Figure l).

In larger machines, tor the purpose of increasing the pressure ot Contact, the following means are provided: Projecting up into recessed portions o1 the underside of the top l, two on each side of the hole 2, are magnets 30. Each magnet 30 has a core 31 which projects upwardly through the top 1 to a point where the top ot the core is ilush with the upper surface et said top 1. The parts of vthe sides oit the base 16 that were cut from the latter to `form the notches 17, 17, are bent downwardly to a horizontal position as shown in Figure 6. To these horizontal sections designated by the numerals 31" and 81 there is ri veted on each side ot' the machine, an elongated flat steel. contact member 32. These members 32 when they come to a position over the magnet cores 31, will be drawn downwardly to them to increase the pressure et the lelt 2S upon the picture that ies between it and the glass 3. rIhis due to the tact that when the members 32 are drawn downwardly, they will exert a downward pull upon the base '1.6 which presses against the felt 28.

For the purpose ot resiliently exerting pressure upon the base 16 to cause the felt below it to 'press firmly upon the picture that lies between. it and the glass, there is riveted to the undersurlface of each transverse inember 111- a lcat' spring whose tree ends are curved upwardly to enable them to slide readily over the base 16 when the latter is raised during the printing of plates. (See liligures 2 and 5). The ends of the base 16 are also curved upwardly to enable it to slide over the telt 28 readily.

Secured to the top o1 the guard 12 is a handle 34 by means ol' which the entire carriage maybe easily moved back and 'forth by the operator. c

Before the operation of printing takes place, the carriage is moved back on Vthe board 29 on the top 1. a suilicient distance to permit the telt 28 to clear the glaml 3. Upon the latter the negatives and printing paper are then. placed, a'ifter which the carriage is moved `forward. by the handlev 34. During this torward movement ot the carriage, the telt 28 is laid by the moving rollers 2O upon the negatives and printing paper as the self-laying track ot a'tractor is l id upon the ground. As soon as the t'elt 28 Yhas covered the negatives and printing paper, contact is automatically effected by the pressure of the springs 33 upon the base 16 above the felt. In larger machines, where the magnets 30 are used, this contact pressure will be increased by the attraction of the armature members 32 by the magnet cores 31 when the printing lights are switched on.

It is thus seen that in my improved printing machine contact is automatically effected without the necessity ot the operator press ing the printing lid against the glass or adjusting catches, which leaves both hands free during the entire exposure. The effort of moving the carriage back and Yforth is reduced to the minimum by the provision oli the ball bearings 8 over which the tubes 9, supporting the carriage, roll. Cleanliness is also secured by having the bearing parts enclosed in the tubes.

Having described .my invention, I claim:

1. In a photographic printing machine. thecombination with a top having a print ing opening, ot a transparent negative and papersupporting medium .in said opening.

a carriage movable back and Yforth over said top, and a seltdaying track whose Ytren ends aresecured to said top behind said printing opening therein adapted to be rolled by the carriage over the transparent medium to insure contact during the exposure oi. the printing paper.

2. In a photographic printing machine. the combination with a top having a printing opening, ot a glass for supporting negatives and paper over said opening, a carriage movable back and forth over said top. a pair of rollersV pivotally secured within said carriage, and a strip ot' fabric whose tree ends are secured to said top behind said opening, said fabric passing around said.

rollers to be rolled thereby over said glass to insure contact during the exposure ot the printing paper.

.In aV photographic printing machine. the combination with a top having a print-l ing opening, oi a transparent negative and papersuppoi.'tin.g medium in said opening. a carriage adapted to be moved over said medium, a member oit magnetic material on said carriage and magnetic means in said top adapted to attract the magnetic member of said carriage, to insure contact during the exposure of the printing paper. i In a photographic printing machine. the combination with` a top having a print; ing opening, et' a transparent negative and paper-supporting medium in said opening, a carriage adapted to be moved over said medium, a pair ot magnets at each side ol" said opening, projecting into the said top, a core in each magnet whose upper end Ais lush with the upper surface oi said top, and armature members fixedly secured to said carriage, adapted to be attracted to said coreswhen the carriage is over said medium,

to insure Contact during the exposure of the printing paper.

5. In a photographic printing machine, the combination with a top having a printing opening, of a glass for supporting n egatives and paper'over said opening, a pair of` elongated tubes, transverse members secured between said tubes, a base anchored to said transverse members, a pair of bearings projecting from each end of said base, a roller pivotally secured in each pair of bearings, a strip of fabric whose free ends are secured `to said top behind the opening, said fabric projecting beneath said base and over the rollers in a position` to be vrolled by` them over saidv glass, and means secured to saidv top for supporting, witha minimum of friction, said tubes to permit to them a reciprocating movement, whereby said fabric may be rolled over and off the glass, for the purpose specified. j Y

6. In a photographic printing machine,

' the combination with a top having a printvjecting side portions of the base, and a similar roller pivotally secured between the rearwardly projecting sides of said base, a strip of fabric whose free ends are secured to said top behind the opening, said fabric projecting beneath said base and over the rollers in a position to be rolled by them over said glass, and means secured to said top for supporting, with a minimum of friction, the elongated tubes to permit to them a reciprocatin movement, whereby said fabric may be ro led over and oii' the glass,'for the purpose specified.

7 In a -photographic printing machine, the combination with a top having a printing opening, of a glass forsupporting negatives and paper over said opening, a pair of velongated tubes, a carriage adapted to be moved by said tubes over and off said glass, brackets secured to said top, inward projections on said brackets, extending through longitudinal slots in said tubes, annular races on said projections within the tubes,

and balls in said races over which the inner peripheries of the tubes are adapted to move when the carriage is moved over or off said glass.

In testimony whereof I have'hereunto set my hand this 5th day of January, 1920.

JOHN J. ROTH. Witness:

HOWARD S. SMITH. 

